Which one is correct?

1.我每天坐公共汽车坐到学校。
2.我每天坐公共汽车到学校。

Which one of the above sentences is correct? Thanks in advance.

If you are trying to say "I'm taking the bus everyday to school" then #2 is correct.  However, if you are saying, "I'm taking the bus everyday straight to school" to emphaize the duration, then you say 我每天坐公共汽车, 一直坐到学校。

As for your other question,

1.我们跳舞跳到十一点。 2.我们跳舞到时一点

#1 is correct.  To make #2 more natural, just omit 舞 and let the context determine that it is a dance and not just the action of jumping around until 1pm!

which one is correct?

1.我每天坐公共汽车坐到学校。
2.我每天坐公共汽车到学校。

which of the above sentences is correct? thanks in advance.

The second one is much better. 第一句话别人也能听懂，就是显得有点啰嗦。